It looks like it's very similar to Vue, except that instead of <script type="application/javascript"> it's <script type="application/x-go"> and the special HTML

It looks like it's very similar to Vue, except that instead of <script type="application/javascript"> it's <script type="application/x-go"> and the special HTML attributes are prefixed with "vg-" instead of "v-". That is: It's lower-level than something you would ask to support ARIA standards. It will support them if the markup you write for your Vugu components supports them. Vugu doesn't ship any built-in components or anything.